import sharp from "sharp";

class ThumbnailerService {
    async fromStream(source, resizeOptions, fit) {
        const imageBuffer = await this.#streamToBuffer(source);
        // const dimensions = this.getDimensions(imageBuffer, percentage, {width, height});
        return sharp(imageBuffer)
            .resize({
                ...resizeOptions,
                fit: fit || 'contain'
            })
            .withMetadata()
            .png()
            .toBuffer();
    }

    #streamToBuffer(stream) {
        return new Promise((resolve, reject) => {
            const buffers = [];
            stream.on("data", function (data) {
                buffers.push(data);
            });

            stream.on("end", function () {
                resolve(Buffer.concat(buffers));
            })
        })
    }
}

const instance = new ThumbnailerService();
export {instance as thumbnailer};